If Blaster, Combat DJ dies at the same time as one or more artifact creatures or Vehicles, the modular abilities it was granting to each of them will trigger.

If a creature with one or more +1/+1 counters on it gets enough -1/-1 counters put on it to cause it to die, it leaves the battlefield with all those counters on it. The modular ability will put a number of +1/+1 counters on the target artifact creature equal to the number of +1/+1 counters on this creature before it left the battlefield.

A spell cast this way enters the battlefield with its back face up.

If you copy a permanent spell cast this way, the copy has the characteristics of the card's back face, even though it isn't itself a double-faced card.

The mana value of a converted permanent on the battlefield is equal to the mana value of the card's front face, no matter which face is up.

Similarly, an ability of another card that instructs you to "transform" one of these cards will cause you to convert it, even if that ability doesn't use the word "convert."

If Blaster, Combat DJ somehow enters the battlefield at the same time as one or more other artifact creatures or Vehicles, none of those creatures or Vehicles will have modular 1 due to Blaster's ability until after they have entered, so they will not enter with the additional +1/+1 counter.

When you cast a spell using its More Than Meets the Eye ability, the card is put onto the stack with its back face up. The resulting spell has all characteristics of that face.

"More Than Meets the Eye [cost]" means "You may cast this card converted by paying [cost] rather than its mana cost." It functions in any zone from which the spell can be cast.

To determine the total cost of a spell, start with the mana cost or alternative cost (such as a More Than Meets the Eye cost) you're paying, add any cost increases, then apply any cost reductions. The mana value of a spell cast using More Than Meets the Eye is determined by the mana cost on the front face of the card, no matter what the total cost to cast the spell was.

The cost is an alternative cost, so it can't be combined with any other alternative costs. It can be combined with any applicable additional costs.

Any triggered ability of another card that triggers whenever a permanent transforms will also trigger whenever a permanent converts.

Converting a permanent doesn't affect any Auras or Equipment that are attached to it. Similarly, any counters on the permanent will remain on that permanent after it converts. Any continuous effects from a resolved spell or ability will continue to affect it. Any spells or abilities on the stack that target a permanent continue to do so after that permanent converts.

The convert keyword action functions the same way as the transform keyword action found on some other cards; to convert a permanent on the battlefield, turn it over so that its other face is up.

Converting into Blaster, Morale Booster from Blaster, Combat DJ does not cause it to get counters from its modular ability.

If Blaster, Morale Booster has fewer than X +1/+1 counters on it as its activated ability resolves, all of its +1/+1 counters are moved.